EP3109519B1 - Seal mechanism - Google Patents
Seal mechanism Download PDFInfo
- Publication number
- EP3109519B1 EP3109519B1 EP15751790.5A EP15751790A EP3109519B1 EP 3109519 B1 EP3109519 B1 EP 3109519B1 EP 15751790 A EP15751790 A EP 15751790A EP 3109519 B1 EP3109519 B1 EP 3109519B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- seal lip
- stopper
- seal
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000007246 mechanism Effects 0.000 title claims description 59
- 239000000463 material Substances 0.000 claims description 32
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- 230000008602 contraction Effects 0.000 description 5
- 239000004696 Poly ether ether ketone Substances 0.000 description 4
- 229920002530 polyetherether ketone Polymers 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 239000000956 alloy Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- -1 polytetrafluoroethylene Polymers 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/322—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip supported in a direction perpendicular to the surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
- F16J15/3228—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip formed by deforming a flat ring
Definitions
- the present relates to a seal mechanism.
- seal mechanisms using a seal lip as shown in Patent Documents 1 and 2 have been used in the past.
- an inner edge portion of an annular seal lip is disposed in contact with a circumferential surface of a shaft, and the seal lip performs sealing while sliding with respect to the shaft when the shaft rotates.
- the seal comprises a seal element and a supporting element, wherein a material of the supporting element has a lower thermal expansion coefficient than a material of the seal element.
- a seal assembly with two sealing mechanisms for providing static and dynamic sealing is known from Patent Document 4, wherein the static sealing mechanism is temperature-activated so that within the operating temperature range, a metallic member of the static seal mechanism is pressed tightly against the associated body to provide a fluid tight static seal.
- the temperature-activation is caused by the metallic member having a different thermal expansion coefficient than the associated body.
- cryogenic temperatures e.g., about -200 °C
- a seal mechanism using a seal lip is not used. This is because the seal lip is generally formed of a material such as an elastomer that becomes brittle at cryogenic temperatures.
- resin materials with high reliability even at cryogenic temperatures have been developed through recent technological developments, and a usage of a seal mechanism using the seal lip made of such a material in a cryogenic temperature environment as described above can be considered in the future.
- the materials with high reliability even at cryogenic temperatures are also resin materials, the materials have high thermal expansion coefficients with respect to a metallic shaft and similarly a metallic housing. That is, the contraction rate when changing from a normal temperature to a cryogenic temperature varies greatly between the resin seal lip and the metallic shaft and the housing. In such a case, when the seal lip contracts while maintaining the coaxial state with the shaft, the seal lip is required to be held about an axis by a uniform force. However, the seal lip is not necessarily held about the axis by the uniform force due to assembling errors and the like that are naturally present.
- the present disclosure has been made in view of the above-described problems, and an object thereof is to provide a seal mechanism having a seal lip and used at cryogenic temperatures that performs good sealing by causing the axis of the seal lip and the axis of the shaft to correspond to each other even at cryogenic temperatures.
- the present disclosure adopts the following configurations as a means for solving the aforementioned problems.
- a first aspect of the present disclosure includes a seal mechanism that is provided with an annular resin seal lip which is disposed coaxially with a shaft and is brought into contact with a circumferential surface of the shaft, wherein the seal mechanism is provided with a stopper that is provided in a metallic housing surrounding the shaft and is disposed between the shaft and a portion of the seal lip other than the edge portion coming into direct contact with the shaft while spaced apart from the circumferential surface of the shaft, the stopper is made of a material having a thermal expansion coefficient smaller than that of a material of which the seal lip is formed, and the seal mechanism has a first state at normal temperature in which a gap is formed between the stopper and the portion of the seal lip, and a second state in which the stopper is brought into contact with the portion of the seal lip which contracts at the time of cooling such that an axis of the seal lip is caused to correspond to an axis of the shaft.
- the stopper has an annular shape and is coaxially provided around the axis of the shaft.
- the stopper is formed of the same material as the housing.
- the seal lip has a bent portion, the bent portion being provided at a position spaced farther away from the shaft than the edge portion and having a contact surface facing the shaft side, and the stopper is disposed between the contact surface of the bent portion and the shaft.
- the seal mechanism according to the present disclosure is provided with a stopper that is disposed between the shaft and a portion of the seal lip other than the edge portion coming into direct contact with the shaft while spaced apart from the circumferential surface of the shaft.
- a stopper is provided in the housing provided around the shaft and comes into contact with the seal lip when cooled.
- the seal lip contracts while supported by the stopper, and it is possible to define the position in the contraction process of the seal lip.
- the axis of the contracting seal lip can be caused to correspond to the axis of the shaft by the stopper. Therefore, according to the present disclosure, in the seal mechanism that has a seal lip and is used at cryogenic temperatures, it is possible to perform good sealing by causing the axis of the seal lip and the axis of the shaft to correspond to each other even at cryogenic temperatures.
- FIG. 1A is a cross-sectional view schematically representing a schematic configuration of a seal mechanism 1 of the present embodiment.
- a seal mechanism 1 of the present embodiment is used by being incorporated into an apparatus (e.g., a rocket engine turbo pump) that has a shaft S and a housing H surrounding the shaft S and is used at cryogenic temperatures.
- the shaft S and the housing H for example, are metallic members formed of a nickel-based alloy and stainless steel.
- FIG. 1A shows only some parts of the shaft S and the housing H.
- FIG. 1A is equipped with a seal lip 2 and a mounting part 3.
- FIG. 1B is a perspective view of the seal lip 2.
- the seal lip 2 is an annular member centered on the axis L1 and is bent in a substantially central portion in a direction perpendicular to an axis L1.
- An inner portion 21 located inside the bent portion (hereinafter referred to as a bent portion 20) has a tapered shape in which an edge portion 21a of the axis L1 side is located on a high pressure side (a left side of the seal mechanism 1 in FIG. 1A ) and in which a root portion 21b of the bent portion 20 side is located on a low pressure side (a right side of the seal mechanism 1 in FIG. 1A ). That is, the shape of the inner portion 21 is set to narrow its diameter toward the high pressure side.
- the edge portion 21a of the inner portion 21 comes into contact with the outer circumferential surface of the shaft S as shown in FIG. 1A , and the edge portion 21a comes into slide-contact with the shaft S when the shaft S rotates.
- An outer portion 22 located outside the bent portion 20 is a portion disposed outside the inner portion 21 and is a thin annular portion having front and back surfaces orthogonal to the axis L1. As shown in FIG. 1A , the outer portion 22 is a portion interposed between the mounting part 3 and the housing H, and functions as a mounting portion that is mounted on the housing H.
- the seal lip 2 is a resin member formed of a resin material that does not easily become brittle at cryogenic temperatures.
- a resin material that does not easily become brittle at cryogenic temperatures.
- PTFE polytetrafluoroethylene
- PEEK polyetheretherketone
- the seal lip 2 may also be formed by utilizing a material obtained by adding polyetheretherketone using a polytetrafluoroethylene material as a base material, and a material obtained by adding polytetrafluoroethylene (another fluorine-based resin may also be used) using a polyetheretherketone material as a base material.
- the aforementioned materials are all resin material and have thermal expansion coefficients higher than the metal material that forms the shaft S and the housing H. Therefore, the seal lip 2 contracts greatly when compared to the shaft S and the housing H when cooled to a cryogenic temperature from a normal temperature.
- the seal lip 2 is mounted on the housing H so that the axis L1 overlaps the axis LS of the shaft S at normal temperatures (see FIG. 1A ). That is, the seal lip 2 is disposed coaxially with the shaft S.
- the mounting part 3 is a part that mounts the seal lip 2 on the housing H and performs centering of the seal lip 2 which contracts when cooled, and the mounting part 3 is equipped with a base portion 31 and a stopper 32.
- the base portion 31 is an annular block-shaped part having substantially the same size as the outer portion 22 of the seal lip 2 when viewed in a direction along the axis LS of the shaft S. As shown in FIG. 1A , the base portion 31 is fixed by bolts or the like (not shown) with respect to the housing H to surround the outer portion 22 of the seal lip 2.
- the stopper 32 is provided on the side closer to the axis LS of the shaft S than the base portion 31, and has a tapered shape in which a tip 32a (see FIGS. 2A and 2B ) of the axis LS side is located near an inner portion 21 of the seal lip 2 and a root portion 32b (see FIGS. 2A and 2B ) is located farther away from the seal lip 2 than the tip 32a. That is, the shape of the stopper 32 is set to narrow toward the seal lip 2 side.
- the stopper 32 is disposed so that the tip 32a enters between the root portion 21b of the seal lip 2 and the shaft S.
- the stopper 32 is disposed between the root portion 21b (a portion other than the edge portion 21a coming into direct contact with the shaft S) of the seal lip 2 and the shaft S to be spaced apart from the outer circumferential surface of the shaft S, and is provided has an annular shape and is coaxially provided around the axis LS of the shaft S.
- the stopper 32 is made of a material having a lower thermal expansion coefficient than the material of which the seal lip 2 is formed, and is formed of the same material as the housing H in the present embodiment. That is, when the housing H is formed of a nickel-based alloy, the stopper 32 is also formed of a nickel-based alloy. Further, the base portion 31 is also formed of the same material as the stopper 32. The base portion 31 and the stopper 32 are integrated to form a single mounting part 3. When the mounting part 3 is fixed to the housing H, the stopper 32 is provided at a predetermined position relative to the housing H.
- the stopper 32 guides the deformation when the diameter of the seal lip 2 reduces so that the axis L1 of the seal lip 2 corresponds to the axis LS of the shaft S, by coming into contact with the root portion 21b of the seal lip 2 that is reduced in diameter when cooled.
- FIG. 2A is an enlarged schematic cross-sectional view including a portion of the seal mechanism 1 at a normal temperature
- FIG. 2B is an enlarged schematic cross-sectional view including a portion of the seal mechanism 1 at a cryogenic temperature.
- FIG. 2A under a normal temperature, a gap is formed between the stopper 32 and the root portion 21b of the seal lip 2.
- the seal mechanism 1 is cooled and the seal lip 2 greatly contracts with respect to the housing H, the shaft S and the stopper 32, as shown in FIG. 2B , the root portion 21b of the seal lip 2 comes into contact with the stopper 32.
- the stopper 32 since the stopper 32 has an annular shape and is coaxially provided around the axis LS of the shaft S, the deformation of the seal lip 2 is supported by the stopper 32 so that the axis L1 of the seal lip 2 corresponds to the axis LS of the shaft S.
- the seal mechanism 1 of the present embodiment is equipped with the stopper 32 that is disposed between the root portion 21b (a portion other than the shaft S coming into direct contact with the edge portion 21a) of the seal lip 2 and the shaft S while spaced apart from the circumferential surface of the shaft S.
- the stopper 32 is provided on the housing H provided around the shaft S and comes into contact with the seal lip 2 when cooled.
- the seal lip 2 contracts while supported by the stopper 32, the position is defined in the contraction process of the seal lip 2.
- the axis L1 of the contracting seal lip 2 to correspond to the axis S of the shaft LS by the stopper 32. Therefore, according to the seal mechanism 1 of the present embodiment, it is possible to perform good sealing by causing the axis LS of the seal lip 2 and the axis L1 of the shaft S to correspond to each other even at cryogenic temperatures.
- the stopper 32 has an annular shape and is coaxially provided around the axis LS of the shaft S. Therefore, even when the seal lip 2 contracts to any degree, it is possible to cause the axis L1 of the seal lip 2 and the axis LS of the shaft S to correspond to each other more reliably by the contact between the stopper 32 and the seal lip 2.
- the stopper 32 is formed of the same material as the housing H. Accordingly, since the stopper 32 and the housing H similarly contract when cooled, the relative positional relation of the stopper 32 with respect to the housing H does not change. Thus, a change in relative positional relation of the stopper 32 with respect to the axis LS of the shaft S is prevented even when cooled, which makes it possible to cause the axis L1 of the seal lip 2 and the axis L2 of the shaft S to correspond to each other more reliably.
- FIGS. 3A and 3B are enlarged schematic cross-sectional views including a portion of the seal mechanism 1A of the present embodiment. Further, FIG. 3A is an enlarged schematic cross-sectional view including a portion of the seal mechanism 1 at a normal temperature, and FIG. 3B is an enlarged schematic cross-sectional view including a portion of the seal mechanism 1 at a cryogenic temperature.
- the seal mechanism 1A is equipped with a mounting part 3 which does not have the stopper 32 described in the aforementioned first embodiment, a seal lip 4 having a bent portion 41, and a stopper 5 provided integrally with the housing H.
- the seal lip 4 has the same annular shape as the seal lip 2 of the first embodiment, and is disposed so that an inner edge portion 42 thereof comes into contact with the outer circumferential surface of the shaft S.
- the bent portion 41 of the seal lip 4 is provided at an end portion on the outer side of the seal lip 4 that is located at a position spaced further apart from the shaft S than the edge portion 42 coming into contact with the shaft S, and the bent portion 41 has a contact surface 41a disposed to face the shaft S side.
- the seal lip 4 is made of the same material as the seal lip 2 of the first embodiment.
- the stopper 5 is formed of the same material as the housing H and is disposed between the bent portion 41 and the shaft S.
- the stopper 5 has an annular shape with a diameter smaller than that of the contact surface 41a of the bent portion 41, and as shown in FIG. 3A , an outer circumferential surface thereof is disposed to face the contact surface 41a of the bent portion 41.
- the stopper 5 guides the deformation at the time of diameter reduction of the seal lip 4 so that the axis of the seal lip 4 corresponds to the axis of the shaft S by coming into contact with the contact surface 41a of the seal lip 4 which is reduced in diameter when cooled.
- the seal mechanism 1A of the embodiment similarly to the seal mechanism of the first embodiment, it is also possible to cause the axis of the contracting seal lip 4 to correspond to the axis of the shaft S by the stopper 5. Therefore, according to the seal mechanism 1A of the present embodiment, it is possible to perform good sealing by causing the axis of the seal lip 4 and the axis of the shaft S to correspond to each other even at cryogenic temperatures.
- the contact surface 41a of the bent portion 41 faces the shaft S side to be orthogonal to the radial direction of the shaft S, it is possible to bring the stopper 5 into contact with the seal lip 4 from the front (a surface facing the contraction direction of the seal lip 4) of the contraction direction. Therefore, it is possible to reliably guide the seal lip 4.
- FIGS. 4A and 4B are enlarged cross-sectional views schematically representing a modified example of the present disclosure.
- FIG. 4A is an enlarged cross-sectional view at the time of a normal temperature
- FIG. 4B is an enlarged cross-sectional view at the time of a cryogenic temperature.
- a seal mechanism 1B having an inverted shape of the seal mechanism 1 may be installed on the high pressure side of the seal mechanism 1 of the first embodiment. In such a case, it is possible to provide a structure with high sealing properties by sealing a fluid such as a flushing gas between the seal mechanism 1 and the seal mechanism 1B.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Description
- The present relates to a seal mechanism.
- For example, seal mechanisms using a seal lip as shown in
Patent Documents 1 and 2 have been used in the past. In such seal mechanisms, an inner edge portion of an annular seal lip is disposed in contact with a circumferential surface of a shaft, and the seal lip performs sealing while sliding with respect to the shaft when the shaft rotates. - A method for manufacturing a seal and a seal are known from
Patent Document 3, the seal comprises a seal element and a supporting element, wherein a material of the supporting element has a lower thermal expansion coefficient than a material of the seal element. - Further, a seal assembly with two sealing mechanisms for providing static and dynamic sealing is known from
Patent Document 4, wherein the static sealing mechanism is temperature-activated so that within the operating temperature range, a metallic member of the static seal mechanism is pressed tightly against the associated body to provide a fluid tight static seal. The temperature-activation is caused by the metallic member having a different thermal expansion coefficient than the associated body. -
- [Patent Document 1]
International Patent Application Publication No.2010/061670 - [Patent Document 2]
International Patent Application Publication No.2006/068047 - [Patent Document 3]
German Patent ApplicationDE 10 2007 063 216 A1 - [Patent Document 4]
US PatentUS 6 547 250 B1 - Meanwhile, since a rocket engine turbo pump or the like reaches cryogenic temperatures (e.g., about -200 °C), a seal mechanism using a seal lip is not used. This is because the seal lip is generally formed of a material such as an elastomer that becomes brittle at cryogenic temperatures. However, resin materials with high reliability even at cryogenic temperatures have been developed through recent technological developments, and a usage of a seal mechanism using the seal lip made of such a material in a cryogenic temperature environment as described above can be considered in the future.
- However, since the materials with high reliability even at cryogenic temperatures are also resin materials, the materials have high thermal expansion coefficients with respect to a metallic shaft and similarly a metallic housing. That is, the contraction rate when changing from a normal temperature to a cryogenic temperature varies greatly between the resin seal lip and the metallic shaft and the housing. In such a case, when the seal lip contracts while maintaining the coaxial state with the shaft, the seal lip is required to be held about an axis by a uniform force. However, the seal lip is not necessarily held about the axis by the uniform force due to assembling errors and the like that are naturally present. Thus, even if the centering between the seal lip and the shaft is correctly performed at the normal temperature, there is a possibility of the axis of the seal lip and the axis of the shaft not corresponding to each other at the cryogenic temperature. When the axis of the seal lip and the axis of the shaft are offset, a deviation in the circumferential direction of the seal lip occurs in the pressure distribution of the seal lip with respect to the shaft. As a result, there is a possibility of the rotation resistance of the shaft increasing or sealing characteristics deteriorating.
- The present disclosure has been made in view of the above-described problems, and an object thereof is to provide a seal mechanism having a seal lip and used at cryogenic temperatures that performs good sealing by causing the axis of the seal lip and the axis of the shaft to correspond to each other even at cryogenic temperatures.
- The present disclosure adopts the following configurations as a means for solving the aforementioned problems.
- A first aspect of the present disclosure includes a seal mechanism that is provided with an annular resin seal lip which is disposed coaxially with a shaft and is brought into contact with a circumferential surface of the shaft, wherein the seal mechanism is provided with a stopper that is provided in a metallic housing surrounding the shaft and is disposed between the shaft and a portion of the seal lip other than the edge portion coming into direct contact with the shaft while spaced apart from the circumferential surface of the shaft, the stopper is made of a material having a thermal expansion coefficient smaller than that of a material of which the seal lip is formed, and the seal mechanism has a first state at normal temperature in which a gap is formed between the stopper and the portion of the seal lip, and a second state in which the stopper is brought into contact with the portion of the seal lip which contracts at the time of cooling such that an axis of the seal lip is caused to correspond to an axis of the shaft.
- According to a second aspect of the present disclosure, in the first aspect, the stopper has an annular shape and is coaxially provided around the axis of the shaft.
- According to a third aspect of the present disclosure, in the first or second aspect, the stopper is formed of the same material as the housing.
- According to a fourth aspect of the present disclosure, in one of the first to third aspects, the seal lip has a bent portion, the bent portion being provided at a position spaced farther away from the shaft than the edge portion and having a contact surface facing the shaft side, and the stopper is disposed between the contact surface of the bent portion and the shaft.
- The seal mechanism according to the present disclosure is provided with a stopper that is disposed between the shaft and a portion of the seal lip other than the edge portion coming into direct contact with the shaft while spaced apart from the circumferential surface of the shaft. Such a stopper is provided in the housing provided around the shaft and comes into contact with the seal lip when cooled. As a result, the seal lip contracts while supported by the stopper, and it is possible to define the position in the contraction process of the seal lip. Thus, the axis of the contracting seal lip can be caused to correspond to the axis of the shaft by the stopper. Therefore, according to the present disclosure, in the seal mechanism that has a seal lip and is used at cryogenic temperatures, it is possible to perform good sealing by causing the axis of the seal lip and the axis of the shaft to correspond to each other even at cryogenic temperatures.
-
-
FIG. 1A is a cross-sectional view schematically representing a schematic structure of a seal mechanism of a first embodiment of the present disclosure. -
FIG. 1B is a perspective view of a seal lip provided in the seal mechanism of the first embodiment of the present disclosure. -
FIG. 2A is an enlarged schematic cross-sectional view including a portion of the seal mechanism of the first embodiment of the present disclosure under a normal temperature. -
FIG. 2B is an enlarged schematic cross-sectional view including a portion of the seal mechanism of the first embodiment of the present disclosure under a cryogenic temperature. -
FIG. 3A is an enlarged schematic cross-sectional view including a portion of the seal mechanism of a second embodiment of the present disclosure under a normal temperature. -
FIG. 3B is an enlarged schematic cross-sectional view including a portion of the seal mechanism of the second embodiment of the present disclosure under a cryogenic temperature. -
FIG. 4A is an enlarged schematic cross-sectional view of a modified example of the present disclosure under a normal temperature. -
FIG. 4B is an enlarged schematic cross-sectional view of a modified example of the present disclosure under a cryogenic temperature. - Hereinafter, an embodiment of a seal mechanism according to the present disclosure will be described with reference to the drawings. In the following drawings, the scales of each member are properly changed to represent each member in a recognizable size.
-
FIG. 1A is a cross-sectional view schematically representing a schematic configuration of a seal mechanism 1 of the present embodiment. As shown inFIG. 1A , a seal mechanism 1 of the present embodiment is used by being incorporated into an apparatus (e.g., a rocket engine turbo pump) that has a shaft S and a housing H surrounding the shaft S and is used at cryogenic temperatures. Further, the shaft S and the housing H, for example, are metallic members formed of a nickel-based alloy and stainless steel. Further,FIG. 1A shows only some parts of the shaft S and the housing H. - As shown in
FIG. 1A , the seal mechanism 1 is equipped with aseal lip 2 and a mountingpart 3.FIG. 1B is a perspective view of theseal lip 2. As shown inFIG. 1B , theseal lip 2 is an annular member centered on the axis L1 and is bent in a substantially central portion in a direction perpendicular to an axis L1. - An
inner portion 21 located inside the bent portion (hereinafter referred to as a bent portion 20) has a tapered shape in which anedge portion 21a of the axis L1 side is located on a high pressure side (a left side of the seal mechanism 1 inFIG. 1A ) and in which aroot portion 21b of thebent portion 20 side is located on a low pressure side (a right side of the seal mechanism 1 inFIG. 1A ). That is, the shape of theinner portion 21 is set to narrow its diameter toward the high pressure side. Theedge portion 21a of theinner portion 21 comes into contact with the outer circumferential surface of the shaft S as shown inFIG. 1A , and theedge portion 21a comes into slide-contact with the shaft S when the shaft S rotates. - An
outer portion 22 located outside thebent portion 20 is a portion disposed outside theinner portion 21 and is a thin annular portion having front and back surfaces orthogonal to the axis L1. As shown inFIG. 1A , theouter portion 22 is a portion interposed between the mountingpart 3 and the housing H, and functions as a mounting portion that is mounted on the housing H. - The
seal lip 2 is a resin member formed of a resin material that does not easily become brittle at cryogenic temperatures. For example, polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK) and the like are used as the material of theseal lip 2. In addition, theseal lip 2 may also be formed by utilizing a material obtained by adding polyetheretherketone using a polytetrafluoroethylene material as a base material, and a material obtained by adding polytetrafluoroethylene (another fluorine-based resin may also be used) using a polyetheretherketone material as a base material. - The aforementioned materials are all resin material and have thermal expansion coefficients higher than the metal material that forms the shaft S and the housing H. Therefore, the
seal lip 2 contracts greatly when compared to the shaft S and the housing H when cooled to a cryogenic temperature from a normal temperature. - The
seal lip 2 is mounted on the housing H so that the axis L1 overlaps the axis LS of the shaft S at normal temperatures (seeFIG. 1A ). That is, theseal lip 2 is disposed coaxially with the shaft S. - The mounting
part 3 is a part that mounts theseal lip 2 on the housing H and performs centering of theseal lip 2 which contracts when cooled, and the mountingpart 3 is equipped with abase portion 31 and astopper 32. - The
base portion 31 is an annular block-shaped part having substantially the same size as theouter portion 22 of theseal lip 2 when viewed in a direction along the axis LS of the shaft S. As shown inFIG. 1A , thebase portion 31 is fixed by bolts or the like (not shown) with respect to the housing H to surround theouter portion 22 of theseal lip 2. - The
stopper 32 is provided on the side closer to the axis LS of the shaft S than thebase portion 31, and has a tapered shape in which atip 32a (seeFIGS. 2A and 2B ) of the axis LS side is located near aninner portion 21 of theseal lip 2 and aroot portion 32b (seeFIGS. 2A and 2B ) is located farther away from theseal lip 2 than thetip 32a. That is, the shape of thestopper 32 is set to narrow toward theseal lip 2 side. Thestopper 32 is disposed so that thetip 32a enters between theroot portion 21b of theseal lip 2 and the shaft S. - That is, the
stopper 32 is disposed between theroot portion 21b (a portion other than theedge portion 21a coming into direct contact with the shaft S) of theseal lip 2 and the shaft S to be spaced apart from the outer circumferential surface of the shaft S, and is provided has an annular shape and is coaxially provided around the axis LS of the shaft S. - Further, the
stopper 32 is made of a material having a lower thermal expansion coefficient than the material of which theseal lip 2 is formed, and is formed of the same material as the housing H in the present embodiment. That is, when the housing H is formed of a nickel-based alloy, thestopper 32 is also formed of a nickel-based alloy. Further, thebase portion 31 is also formed of the same material as thestopper 32. Thebase portion 31 and thestopper 32 are integrated to form a single mountingpart 3. When the mountingpart 3 is fixed to the housing H, thestopper 32 is provided at a predetermined position relative to the housing H. - The
stopper 32 guides the deformation when the diameter of theseal lip 2 reduces so that the axis L1 of theseal lip 2 corresponds to the axis LS of the shaft S, by coming into contact with theroot portion 21b of theseal lip 2 that is reduced in diameter when cooled. -
FIG. 2A is an enlarged schematic cross-sectional view including a portion of the seal mechanism 1 at a normal temperature, andFIG. 2B is an enlarged schematic cross-sectional view including a portion of the seal mechanism 1 at a cryogenic temperature. As shown inFIG. 2A , under a normal temperature, a gap is formed between thestopper 32 and theroot portion 21b of theseal lip 2. When the seal mechanism 1 is cooled and theseal lip 2 greatly contracts with respect to the housing H, the shaft S and thestopper 32, as shown inFIG. 2B , theroot portion 21b of theseal lip 2 comes into contact with thestopper 32. Here, since thestopper 32 has an annular shape and is coaxially provided around the axis LS of the shaft S, the deformation of theseal lip 2 is supported by thestopper 32 so that the axis L1 of theseal lip 2 corresponds to the axis LS of the shaft S. - The seal mechanism 1 of the present embodiment is equipped with the
stopper 32 that is disposed between theroot portion 21b (a portion other than the shaft S coming into direct contact with theedge portion 21a) of theseal lip 2 and the shaft S while spaced apart from the circumferential surface of the shaft S. Thestopper 32 is provided on the housing H provided around the shaft S and comes into contact with theseal lip 2 when cooled. As a result, when theseal lip 2 contracts while supported by thestopper 32, the position is defined in the contraction process of theseal lip 2. Thus, it is possible to cause the axis L1 of thecontracting seal lip 2 to correspond to the axis S of the shaft LS by thestopper 32. Therefore, according to the seal mechanism 1 of the present embodiment, it is possible to perform good sealing by causing the axis LS of theseal lip 2 and the axis L1 of the shaft S to correspond to each other even at cryogenic temperatures. - Further, in the seal mechanism 1 of the present embodiment, the
stopper 32 has an annular shape and is coaxially provided around the axis LS of the shaft S. Therefore, even when theseal lip 2 contracts to any degree, it is possible to cause the axis L1 of theseal lip 2 and the axis LS of the shaft S to correspond to each other more reliably by the contact between thestopper 32 and theseal lip 2. - Further, in the seal mechanism 1 of the present embodiment, the
stopper 32 is formed of the same material as the housing H. Accordingly, since thestopper 32 and the housing H similarly contract when cooled, the relative positional relation of thestopper 32 with respect to the housing H does not change. Thus, a change in relative positional relation of thestopper 32 with respect to the axis LS of the shaft S is prevented even when cooled, which makes it possible to cause the axis L1 of theseal lip 2 and the axis L2 of the shaft S to correspond to each other more reliably. - Next, a second embodiment of the present disclosure will be described. In the present embodiment, the same parts as in the aforementioned first embodiment will not be described.
-
FIGS. 3A and 3B are enlarged schematic cross-sectional views including a portion of theseal mechanism 1A of the present embodiment. Further,FIG. 3A is an enlarged schematic cross-sectional view including a portion of the seal mechanism 1 at a normal temperature, andFIG. 3B is an enlarged schematic cross-sectional view including a portion of the seal mechanism 1 at a cryogenic temperature. - As shown in
FIGS. 3A and 3B , theseal mechanism 1A according to the present embodiment is equipped with a mountingpart 3 which does not have thestopper 32 described in the aforementioned first embodiment, aseal lip 4 having abent portion 41, and astopper 5 provided integrally with the housing H. - The
seal lip 4 has the same annular shape as theseal lip 2 of the first embodiment, and is disposed so that aninner edge portion 42 thereof comes into contact with the outer circumferential surface of the shaft S. Thebent portion 41 of theseal lip 4 is provided at an end portion on the outer side of theseal lip 4 that is located at a position spaced further apart from the shaft S than theedge portion 42 coming into contact with the shaft S, and thebent portion 41 has acontact surface 41a disposed to face the shaft S side. Theseal lip 4 is made of the same material as theseal lip 2 of the first embodiment. - The
stopper 5 is formed of the same material as the housing H and is disposed between thebent portion 41 and the shaft S. Thestopper 5 has an annular shape with a diameter smaller than that of thecontact surface 41a of thebent portion 41, and as shown inFIG. 3A , an outer circumferential surface thereof is disposed to face thecontact surface 41a of thebent portion 41. As shown inFIG. 3B , thestopper 5 guides the deformation at the time of diameter reduction of theseal lip 4 so that the axis of theseal lip 4 corresponds to the axis of the shaft S by coming into contact with thecontact surface 41a of theseal lip 4 which is reduced in diameter when cooled. - In the
seal mechanism 1A of the embodiment, similarly to the seal mechanism of the first embodiment, it is also possible to cause the axis of thecontracting seal lip 4 to correspond to the axis of the shaft S by thestopper 5. Therefore, according to theseal mechanism 1A of the present embodiment, it is possible to perform good sealing by causing the axis of theseal lip 4 and the axis of the shaft S to correspond to each other even at cryogenic temperatures. - Furthermore, in the
seal mechanism 1A of the present embodiment, since thecontact surface 41a of thebent portion 41 faces the shaft S side to be orthogonal to the radial direction of the shaft S, it is possible to bring thestopper 5 into contact with theseal lip 4 from the front (a surface facing the contraction direction of the seal lip 4) of the contraction direction. Therefore, it is possible to reliably guide theseal lip 4. - While preferred embodiments of the present disclosure have been described with reference to the accompanying drawings, it is a matter of course that the present disclosure is not limited to the above-described embodiments. Various shapes or combinations of respective constituent elements shown in the above embodiment are merely examples, and various modifications can be made based on design requirements or the like within the scope that does not depart from the scope of the present disclosure.
-
FIGS. 4A and 4B are enlarged cross-sectional views schematically representing a modified example of the present disclosure.FIG. 4A is an enlarged cross-sectional view at the time of a normal temperature, andFIG. 4B is an enlarged cross-sectional view at the time of a cryogenic temperature. As shown inFIGS. 4A and 4B , aseal mechanism 1B having an inverted shape of the seal mechanism 1 may be installed on the high pressure side of the seal mechanism 1 of the first embodiment. In such a case, it is possible to provide a structure with high sealing properties by sealing a fluid such as a flushing gas between the seal mechanism 1 and theseal mechanism 1B. - In the seal mechanism having the seal lip and used at cryogenic temperatures, it is possible to perform a good seal by causing the axis of the seal lip and the axis of the shaft to correspond to each other even at cryogenic temperatures.
-
- 1, 1A, 1B Seal mechanism
- 2, 4 Seal lip
- 3 Mounting part
- 5, 32 Stopper
- 20 Bent portion
- 21 Inner portion
- 21a, 42 Edge portion
- 21b Root portion
- 22 Outer portion
- 31 Base portion
- 32a Tip
- 32b Root portion
- 41 Bent portion
- 41a Contact surface
- H Housing
- L1 Axis of seal lip
- LS Axis of shaft
- S Shaft
Claims (8)
- A seal mechanism (1, 1A, 1B) that is provided with an annular resin seal lip (2, 4) which is disposed coaxially with a shaft (S) and is brought into contact with a circumferential surface of the shaft (S),
the seal mechanism (1) further comprising:a stopper (5, 32) that is provided in a metallic housing (H) surrounding the shaft (S) and is disposed between the shaft (S) and a portion (21b, 41) of the seal lip (2, 4) other than the edge portion (21a, 42) coming into direct contact with the shaft (S) while spaced apart from the circumferential surface of the shaft (S); andthe stopper (5, 32) is made of a material having a thermal expansion coefficient smaller than that of a material of which the seal lip (2, 4) is formed, andcharacterised in that the seal mechanism (1, 1A, 1B) has a first state at normal temperature in which a gap is formed between the stopper (5, 32) and the portion (21b, 41) of the seal lip (2, 4), and a second state in which the stopper (5, 32) is brought into contact with the portion (21b, 41) of the seal lip (2, 4) which contracts at the time of cooling such that an axis of the seal lip (2, 4) is caused to correspond to an axis of the shaft (S). - The seal mechanism (1, 1B) of claim 1, wherein the stopper (32) has an annular shape and is coaxially provided around the axis of the shaft (S).
- The seal mechanism (1A) of claim 1, wherein the stopper (5) is formed of the same material as the housing (H).
- The seal mechanism (1, 1B) of claim 2, wherein the stopper (32) is formed of the same material as the housing (H).
- The seal mechanism (1A) of claim 1, wherein the seal lip (2) has a bent portion (20, 41), the bent portion (20, 41) being provided at a position spaced farther away from the shaft (S) than the edge portion (42) and having a contact surface (41a) facing the shaft side, and
the stopper (5) is disposed between the contact surface (41a) of the bent portion (20, 41) and the shaft (S). - The seal mechanism (1, 1B) of claim 2, wherein the seal lip (2) has a bent portion (20, 41), the bent portion (20, 41) being provided at a position spaced farther away from the shaft (S) than the edge portion (21a) and having a contact surface (41a) facing the shaft side, and
the stopper (32) is disposed between the contact surface (41a) of the bent portion (20, 41) and the shaft (S). - The seal mechanism (1A) of claim 3, wherein the seal lip (2) has a bent portion (20, 41), the bent portion (20, 41) being provided at a position spaced farther away from the shaft (S) than the edge portion (42) and having a contact surface (41a) facing the shaft side, and
the stopper (5) is disposed between the contact surface (41a) of the bent portion (20, 41) and the shaft (S). - The seal mechanism (1, 1B) of claim 4, wherein the seal lip (2) has a bent portion (20, 41), the bent portion (20, 41) being provided at a position spaced farther away from the shaft (S) than the edge portion (21a) and having a contact surface (41a) facing the shaft side, and
the stopper (32) is disposed between the contact surface (41a) of the bent portion (20, 41) and the shaft (S).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014031553A JP6248692B2 (en) | 2014-02-21 | 2014-02-21 | Seal mechanism |
PCT/JP2015/055049 WO2015125959A1 (en) | 2014-02-21 | 2015-02-23 | Seal mechanism |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3109519A1 EP3109519A1 (en) | 2016-12-28 |
EP3109519A4 EP3109519A4 (en) | 2017-11-01 |
EP3109519B1 true EP3109519B1 (en) | 2019-09-18 |
Family
ID=53878455
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15751790.5A Active EP3109519B1 (en) | 2014-02-21 | 2015-02-23 | Seal mechanism |
Country Status (4)
Country | Link |
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US (1) | US10323750B2 (en) |
EP (1) | EP3109519B1 (en) |
JP (1) | JP6248692B2 (en) |
WO (1) | WO2015125959A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102139735B1 (en) * | 2018-07-02 | 2020-07-31 | 한국씰마스타주식회사 | One-stop seal for high temperature, high pressure applications |
JP2020176673A (en) * | 2019-04-17 | 2020-10-29 | ナブテスコ株式会社 | Seal structure and seal |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3512789A (en) * | 1967-03-31 | 1970-05-19 | Charles L Tanner | Cryogenic face seal |
US3997142A (en) * | 1975-04-21 | 1976-12-14 | Fmc Corporation | Pressure sensitive and temperature responsive rotary valve |
DE3221526C2 (en) * | 1982-06-08 | 1986-03-13 | Fa. Carl Freudenberg, 6940 Weinheim | Shaft seal |
JPH0342279Y2 (en) * | 1987-11-12 | 1991-09-04 | ||
JP3077410B2 (en) * | 1992-07-29 | 2000-08-14 | アイシン精機株式会社 | Turbocharger turbine housing |
US5524846A (en) * | 1993-12-21 | 1996-06-11 | The Boeing Company | Fire protection system for airplanes |
JP2961687B2 (en) * | 1996-05-17 | 1999-10-12 | イーグル工業株式会社 | Lip type seal |
US6547250B1 (en) * | 2000-08-21 | 2003-04-15 | Westport Research Inc. | Seal assembly with two sealing mechanisms for providing static and dynamic sealing |
WO2006068047A1 (en) | 2004-12-20 | 2006-06-29 | Eagle Industry Co., Ltd. | Shaft sealing device |
DE102007063216B4 (en) * | 2007-12-20 | 2018-04-26 | Elringklinger Ag | Method for producing a seal |
KR101599021B1 (en) * | 2008-11-27 | 2016-03-02 | 이글 고우교 가부시기가이샤 | Lip type seal |
-
2014
- 2014-02-21 JP JP2014031553A patent/JP6248692B2/en active Active
-
2015
- 2015-02-23 EP EP15751790.5A patent/EP3109519B1/en active Active
- 2015-02-23 WO PCT/JP2015/055049 patent/WO2015125959A1/en active Application Filing
-
2016
- 2016-06-30 US US15/198,413 patent/US10323750B2/en active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
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US20160305553A1 (en) | 2016-10-20 |
EP3109519A1 (en) | 2016-12-28 |
WO2015125959A1 (en) | 2015-08-27 |
JP2015155739A (en) | 2015-08-27 |
EP3109519A4 (en) | 2017-11-01 |
JP6248692B2 (en) | 2017-12-20 |
US10323750B2 (en) | 2019-06-18 |
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